third_party/libpng/LICENSE - skia - Git at Google

 /*
  * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
  *
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *
  * This code is released under the libpng license.
  *
  * libpng versions 1.2.6, August 15, 2004, through 1.6.16, December 22, 2014, are
  * Copyright (c) 2004, 2006-2014 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
  *
  *    Cosmin Truta
  *
  * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
  * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.0.6
  * with the following individuals added to the list of Contributing Authors:
  *
  *    Simon-Pierre Cadieux
  *    Eric S. Raymond
  *    Gilles Vollant
  *
  * and with the following additions to the disclaimer:
  *
  *    There is no warranty against interference with your enjoyment of the
  *    library or against infringement.  There is no warranty that our
  *    efforts or the library will fulfill any of your particular purposes
  *    or needs.  This library is provided with all faults, and the entire
  *    risk of satisfactory quality, performance, accuracy, and effort is with
  *    the user.
  *
  * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-0.96,
  * with the following individuals added to the list of Contributing Authors:
  *
  *    Tom Lane
  *    Glenn Randers-Pehrson
  *    Willem van Schaik
  *
  * libpng versions 0.89, June 1996, through 0.96, May 1997, are
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Distributed according to the same disclaimer and license as libpng-0.88,
  * with the following individuals added to the list of Contributing Authors:
  *
  *    John Bowler
  *    Kevin Bracey
  *    Sam Bushell
  *    Magnus Holmgren
  *    Greg Roelofs
  *    Tom Tanner
  *
  * libpng versions 0.5, May 1995, through 0.88, January 1996, are
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  *
  * For the purposes of this copyright and license, "Contributing Authors"
  * is defined as the following set of individuals:
  *
  *    Andreas Dilger
  *    Dave Martindale
  *    Guy Eric Schalnat
  *    Paul Schmidt
  *    Tim Wegner
  *
  * The PNG Reference Library is supplied "AS IS".  The Contributing Authors
  * and Group 42, Inc. disclaim all warranties, expressed or implied,
  * including, without limitation, the warranties of merchantability and of
  * fitness for any purpose.  The Contributing Authors and Group 42, Inc.
  * assume no liability for direct, indirect, incidental, special, exemplary,
  * or consequential damages, which may result from the use of the PNG
  * Reference Library, even if advised of the possibility of such damage.
  *
  * Permission is hereby granted to use, copy, modify, and distribute this
  * source code, or portions hereof, for any purpose, without fee, subject
  * to the following restrictions:
  *
  *   1. The origin of this source code must not be misrepresented.
  *
  *   2. Altered versions must be plainly marked as such and must not
  *      be misrepresented as being the original source.
  *
  *   3. This Copyright notice may not be removed or altered from
  *      any source or altered source distribution.
  *
  * The Contributing Authors and Group 42, Inc. specifically permit, without
  * fee, and encourage the use of this source code as a component to
  * supporting the PNG file format in commercial products.  If you use this
  * source code in a product, acknowledgment is not required but would be
  * appreciated.
  */

 /*
  * A "png_get_copyright" function is available, for convenient use in "about"
  * boxes and the like:
  *
  *     printf("%s", png_get_copyright(NULL));
  *
  * Also, the PNG logo (in PNG format, of course) is supplied in the
  * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
  */

 /*
  * Libpng is OSI Certified Open Source Software.  OSI Certified is a
  * certification mark of the Open Source Initiative.
  */

 /*
  * The contributing authors would like to thank all those who helped
  * with testing, bug fixes, and patience.  This wouldn't have been
  * possible without all of you.
  *
  * Thanks to Frank J. T. Wojcik for helping with the documentation.
  */

 /*
  * Y2K compliance in libpng:
  * =========================
  *
  *    December 22, 2014
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
  *    upward through 1.6.16 are Y2K compliant.  It is my belief that
  *    earlier versions were also Y2K compliant.
  *
  *    Libpng only has two year fields.  One is a 2-byte unsigned integer
  *    that will hold years up to 65535.  The other, which is deprecated,
  *    holds the date in text format, and will hold years up to 9999.
  *
  *    The integer is
  *        "png_uint_16 year" in png_time_struct.
  *
  *    The string is
  *        "char time_buffer[29]" in png_struct.  This is no longer used
  *    in libpng-1.6.x and will be removed from libpng-1.7.0.
  *
  *    There are seven time-related functions:
  *        png.c: png_convert_to_rfc_1123_buffer() in png.c
  *          (formerly png_convert_to_rfc_1123() prior to libpng-1.5.x and
  *          png_convert_to_rfc_1152() in error prior to libpng-0.98)
  *        png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
  *        png_convert_from_time_t() in pngwrite.c
  *        png_get_tIME() in pngget.c
  *        png_handle_tIME() in pngrutil.c, called in pngread.c
  *        png_set_tIME() in pngset.c
  *        png_write_tIME() in pngwutil.c, called in pngwrite.c
  *
  *    All handle dates properly in a Y2K environment.  The
  *    png_convert_from_time_t() function calls gmtime() to convert from system
  *    clock time, which returns (year - 1900), which we properly convert to
  *    the full 4-digit year.  There is a possibility that libpng applications
  *    are not passing 4-digit years into the png_convert_to_rfc_1123_buffer()
  *    function, or that they are incorrectly passing only a 2-digit year
  *    instead of "year - 1900" into the png_convert_from_struct_tm() function,
  *    but this is not under our control.  The libpng documentation has always
  *    stated that it works with 4-digit years, and the APIs have been
  *    documented as such.
  *
  *    The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
  *    integer to hold the year, and can hold years as large as 65535.
  *
  *    zlib, upon which libpng depends, is also Y2K compliant.  It contains
  *    no date-related code.
  *
  *       Glenn Randers-Pehrson
  *       libpng maintainer
  *       PNG Development Group
  */
	/*
	* COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
	*
	* If you modify libpng you may insert additional notices immediately following
	* this sentence.
	*
	* This code is released under the libpng license.
	*
	* libpng versions 1.2.6, August 15, 2004, through 1.6.16, December 22, 2014, are
	* Copyright (c) 2004, 2006-2014 Glenn Randers-Pehrson, and are
	* distributed according to the same disclaimer and license as libpng-1.2.5
	* with the following individual added to the list of Contributing Authors:
	*
	* Cosmin Truta
	*
	* libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
	* Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
	* distributed according to the same disclaimer and license as libpng-1.0.6
	* with the following individuals added to the list of Contributing Authors:
	*
	* Simon-Pierre Cadieux
	* Eric S. Raymond
	* Gilles Vollant
	*
	* and with the following additions to the disclaimer:
	*
	* There is no warranty against interference with your enjoyment of the
	* library or against infringement. There is no warranty that our
	* efforts or the library will fulfill any of your particular purposes
	* or needs. This library is provided with all faults, and the entire
	* risk of satisfactory quality, performance, accuracy, and effort is with
	* the user.
	*
	* libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
	* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
	* distributed according to the same disclaimer and license as libpng-0.96,
	* with the following individuals added to the list of Contributing Authors:
	*
	* Tom Lane
	* Glenn Randers-Pehrson
	* Willem van Schaik
	*
	* libpng versions 0.89, June 1996, through 0.96, May 1997, are
	* Copyright (c) 1996, 1997 Andreas Dilger
	* Distributed according to the same disclaimer and license as libpng-0.88,
	* with the following individuals added to the list of Contributing Authors:
	*
	* John Bowler
	* Kevin Bracey
	* Sam Bushell
	* Magnus Holmgren
	* Greg Roelofs
	* Tom Tanner
	*
	* libpng versions 0.5, May 1995, through 0.88, January 1996, are
	* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
	*
	* For the purposes of this copyright and license, "Contributing Authors"
	* is defined as the following set of individuals:
	*
	* Andreas Dilger
	* Dave Martindale
	* Guy Eric Schalnat
	* Paul Schmidt
	* Tim Wegner
	*
	* The PNG Reference Library is supplied "AS IS". The Contributing Authors
	* and Group 42, Inc. disclaim all warranties, expressed or implied,
	* including, without limitation, the warranties of merchantability and of
	* fitness for any purpose. The Contributing Authors and Group 42, Inc.
	* assume no liability for direct, indirect, incidental, special, exemplary,
	* or consequential damages, which may result from the use of the PNG
	* Reference Library, even if advised of the possibility of such damage.
	*
	* Permission is hereby granted to use, copy, modify, and distribute this
	* source code, or portions hereof, for any purpose, without fee, subject
	* to the following restrictions:
	*
	* 1. The origin of this source code must not be misrepresented.
	*
	* 2. Altered versions must be plainly marked as such and must not
	* be misrepresented as being the original source.
	*
	* 3. This Copyright notice may not be removed or altered from
	* any source or altered source distribution.
	*
	* The Contributing Authors and Group 42, Inc. specifically permit, without
	* fee, and encourage the use of this source code as a component to
	* supporting the PNG file format in commercial products. If you use this
	* source code in a product, acknowledgment is not required but would be
	* appreciated.
	*/

	/*
	* A "png_get_copyright" function is available, for convenient use in "about"
	* boxes and the like:
	*
	* printf("%s", png_get_copyright(NULL));
	*
	* Also, the PNG logo (in PNG format, of course) is supplied in the
	* files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
	*/

	/*
	* Libpng is OSI Certified Open Source Software. OSI Certified is a
	* certification mark of the Open Source Initiative.
	*/

	/*
	* The contributing authors would like to thank all those who helped
	* with testing, bug fixes, and patience. This wouldn't have been
	* possible without all of you.
	*
	* Thanks to Frank J. T. Wojcik for helping with the documentation.
	*/

	/*
	* Y2K compliance in libpng:
	* =========================
	*
	* December 22, 2014
	*
	* Since the PNG Development group is an ad-hoc body, we can't make
	* an official declaration.
	*
	* This is your unofficial assurance that libpng from version 0.71 and
	* upward through 1.6.16 are Y2K compliant. It is my belief that
	* earlier versions were also Y2K compliant.
	*
	* Libpng only has two year fields. One is a 2-byte unsigned integer
	* that will hold years up to 65535. The other, which is deprecated,
	* holds the date in text format, and will hold years up to 9999.
	*
	* The integer is
	* "png_uint_16 year" in png_time_struct.
	*
	* The string is
	* "char time_buffer[29]" in png_struct. This is no longer used
	* in libpng-1.6.x and will be removed from libpng-1.7.0.
	*
	* There are seven time-related functions:
	* png.c: png_convert_to_rfc_1123_buffer() in png.c
	* (formerly png_convert_to_rfc_1123() prior to libpng-1.5.x and
	* png_convert_to_rfc_1152() in error prior to libpng-0.98)
	* png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
	* png_convert_from_time_t() in pngwrite.c
	* png_get_tIME() in pngget.c
	* png_handle_tIME() in pngrutil.c, called in pngread.c
	* png_set_tIME() in pngset.c
	* png_write_tIME() in pngwutil.c, called in pngwrite.c
	*
	* All handle dates properly in a Y2K environment. The
	* png_convert_from_time_t() function calls gmtime() to convert from system
	* clock time, which returns (year - 1900), which we properly convert to
	* the full 4-digit year. There is a possibility that libpng applications
	* are not passing 4-digit years into the png_convert_to_rfc_1123_buffer()
	* function, or that they are incorrectly passing only a 2-digit year
	* instead of "year - 1900" into the png_convert_from_struct_tm() function,
	* but this is not under our control. The libpng documentation has always
	* stated that it works with 4-digit years, and the APIs have been
	* documented as such.
	*
	* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
	* integer to hold the year, and can hold years as large as 65535.
	*
	* zlib, upon which libpng depends, is also Y2K compliant. It contains
	* no date-related code.
	*
	* Glenn Randers-Pehrson
	* libpng maintainer
	* PNG Development Group
	*/